<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #app {
            width: 300px;
            height: 150px;
            background-color: aqua;
            text-align: center;
            margin: 0 auto;
        }
    </style>
    <style scoped>
        .login {
            background-color: aliceblue;
        }
    </style>
    <style scoped>
        .register {
            background-color: aquamarine;
        }
    </style>
    <script src="../lib/vue.js"></script>
</head>

<body>
    <div id="app">
        <a href="" @click.prevent="flag=true">登录</a>
        <a href="" @click.prevent="flag=false">注册</a>

        <login v-if="flag" class="login"></login>
        <register v-else="flag" class="register"></register>

    </div>

    <script>
        Vue.component('login', {
            template: '<h3>登录组件</h3>'
        })

        Vue.component('register', {
            template: '<h3>注册组件</h3>'
        })

        var vm = new Vue({
            el: '#app',
            data: {
                flag: false
            },
            methods: {}
        });
    </script>
</body>

</html>